Chaotic and Clumpy Galaxy Formation in an Extremely Massive Reionization-era Halo
Chaotic and Clumpy Galaxy Formation in an Extremely Massive Reionization-era Halo
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DOI：
10.3847/2041-8213/ac61e6
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发表时间：
2022-03
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通讯作者：
J. Spilker;C. Hayward;D. Marrone;M. Aravena;M. Béthermin;James Burgoyne;S. Chapman;T. Greve;G. Gururajan;Y. Hezaveh;R. Hill;K. Litke;C. Lovell;M. Malkan;E. Murphy;D. Narayanan;K. Phadke;C. Reuter;A. Stark;N. Sulzenauer;J. Vieira;D. Vizgan;A. Weiss
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作者：
J. Spilker;C. Hayward;D. Marrone;M. Aravena;M. Béthermin;James Burgoyne;S. Chapman;T. Greve;G. Gururajan;Y. Hezaveh;R. Hill;K. Litke;C. Lovell;M. Malkan;E. Murphy;D. Narayanan;K. Phadke;C. Reuter;A. Stark;N. Sulzenauer;J. Vieira;D. Vizgan;A. Weiss
z = 6.900的SPT 0311-58系统是再电离时期内的一个极其巨大的结构，并提供了一个了解原始密度场极端峰值星系形成的机会。我们提出了70 mas阿塔卡马大型毫米/亚毫米阵列观测的尘埃连续体和[C ii] 158 μm的发射在中央对星系和达到100-350 pc的物理分辨率，其中最详细的意见，任何再电离时代的系统日期。观测结果将源解析为至少12个千秒差距大小的团块。星系内部的整体运动学和高湍流速度色散与最近声称的一些尘埃星系中的动态冷薄盘运动学形成了鲜明的对比。我们推测，引力相互作用和来自大质量母盘的碎片可能在系统的整体动力学和团块形成中发挥了作用。每个星系团的质量都与其他在静止紫外/光学深场巡天中发现的6 < z < 8星系相当，但星星的形成率提高了3-5倍。在内部，团块本身与在低红移星系中发现的维里化云尺度结构的放大版本非常相似。我们的观察是定性相似的大规模晕内看到的模拟高红移星系的混乱和clupholic大会。
The SPT 0311–58 system at z = 6.900 is an extremely massive structure within the reionization epoch and offers a chance to understand the formation of galaxies at an extreme peak in the primordial density field. We present 70 mas Atacama Large Millimeter/submillimeter Array observations of the dust continuum and [C ii] 158 μm emission in the central pair of galaxies and reach physical resolutions of ∼100–350 pc, among the most detailed views of any reionization-era system to date. The observations resolve the source into at least a dozen kiloparsec-size clumps. The global kinematics and high turbulent velocity dispersion within the galaxies present a striking contrast to recent claims of dynamically cold thin-disk kinematics in some dusty galaxies just 800 Myr later at z ∼ 4. We speculate that both gravitational interactions and fragmentation from massive parent disks have likely played a role in the overall dynamics and formation of clumps in the system. Each clump individually is comparable in mass to other 6 < z < 8 galaxies identified in rest-UV/optical deep field surveys, but with star formation rates elevated by a factor of ~3-5. Internally, the clumps themselves bear close resemblance to greatly scaled-up versions of virialized cloud-scale structures identified in low-redshift galaxies. Our observations are qualitatively similar to the chaotic and clumpy assembly within massive halos seen in simulations of high-redshift galaxies.